Chapter 5

Question 1

True or False

The increased mineral content in enamel is dependent on the removal of fluid and protein

Answer 1

True

Question 2

What is the mineral content of enamel?

Answer 2

95%

Question 3

What is the mineral content of dentin?

Answer 3

69%

Question 4

The ameloblast shorten and contract the stratum intermedium and other enamel epithelium and fuse together to form ________

Answer 4

reduced enamel epithelium

Question 5

The stage of plaque formation and attachment is known as _____

Answer 5

protective stage of ameloblast function

Question 6

True or False

The inner cell layer of the root sheath forms the inner enamel epithelium/ameloblast in the crown and enamel is produced

Answer 6

True

Question 7

When the crown is completed the cells in this region of enamel continue to grow forming a double layer of cells termed _______

Answer 7

epithelial root sheath/hurtwig’s epithelial root sheath

Question 8

Bone that forms between the roots of multi-rooted teeth forms the _________

Answer 8

interradicular bone

Question 9

Tooth development involves which two types of tissues?

Answer 9

mesenchymal and epithelial

Question 10

Which cells form the dental papilla in early tooth development?

Answer 10

mesenchymal

Question 11

Which is the initial stage of early tooth development?

Answer 11

bud

Question 12

Which genetic abnormality is characterized by more than six congenitally missing teeth?

Answer 12

oligodontia

Question 13

The ________________ are the last teeth to develop.

Answer 13

third molars

Question 14

Which tissue surrounds the embryonic pulp in the “cap” stage of tooth development?

Answer 14

dental follicle

Question 15

_____________ form enamel.

Answer 15

ameloblasts

Question 16

Outer enamel epithelial (OEE) cells of the enamel organ serve which function?

Answer 16

They organize a network of capillaries to support ameloblast cells

Question 17

Predentin is composed of ______ noncollagenous protein.

Answer 17

10%

Question 18

Which characterizes the dental papilla?

Answer 18

densely packed cells

Question 19

Tomes processes develop during which stage of amelogenesis?

Answer 19

secretion

Question 20

Ameloblasts are fastened to the stratum intermedium by

Answer 20

desmosomes

Question 21

Which percentage of enamel is water?

Answer 21

5%

Question 22

Which is removed to increase the mineral content of enamel?

Answer 22

hydroxyapatite

Question 23

Which two cellular layers fuse to form the reduced enamel epithelium (REE)?

Answer 23

Ameloblasts and stratum intermedium

Question 24

Which type of bone forms between the roots of multirooted teeth?

Answer 24

interradicular

Question 25

The highest fiber turnover in the periodontal ligament occurs in the

Answer 25

apical region